An atom- and pot-economical consecutive multi-step reaction approach to polycyclic aromatic hydrocarbons (PAHs)

2017 ◽  
Vol 53 (11) ◽  
pp. 1904-1907 ◽  
Author(s):  
Chada Raji Reddy ◽  
Uredi Dilipkumar ◽  
Ravula Shravya
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Reaction Conditions ◽  
Metal Free ◽  
Polycyclic Aromatic

A novel [4+2]-benzannulation approach to substituted polycyclic aromatic hydrocarbons has been developed under atom-economical, mild and metal-free reaction conditions.

scholarly journals Polycyclic aromatic azomethine ylides: a unique entry to extended polycyclic heteroaromatics

2015 ◽  
Vol 6 (1) ◽  
pp. 436-441 ◽  
Author(s):  
Reinhard Berger ◽  
Manfred Wagner ◽  
Xinliang Feng ◽  
Klaus Müllen
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Azomethine Ylides ◽  
Metal Free ◽  
Polycyclic Aromatic

Based on polycyclic aromatic azomethine ylides, a metal-free “cycloaddition-planarization-sequence” is proposed, providing a unique entry to nitrogen-containing polycyclic aromatic hydrocarbons.

Metal-free naphthannulation reactions of yne-allenone esters for accessing polycyclic aromatic hydrocarbons

2018 ◽  
Vol 54 (74) ◽  
pp. 10415-10418 ◽  
Author(s):  
Hong-Kai Sha ◽  
Ting Xu ◽  
Feng Liu ◽  
Bu-Zheng Tang ◽  
Wen-Juan Hao ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Free Base ◽  
Metal Free ◽  
Direct Assembly ◽  
Wide Range ◽  
Polycyclic Aromatic

The first metal-free base-promoted naphthannulation reactions of yne-allenone esters were developed for the direct assembly of a wide range of polycyclic aromatic hydrocarbons with generally good yields.

Modular metal-free catalytic radical annulation of cyclic diaryliodoniums to access π-extended arenes

2021 ◽  
Author(s):  
Daqian Zhu ◽  
Hui Peng ◽  
Yameng Sun ◽  
Zhouming Wu ◽  
Yun Wang ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Free Radical ◽  
Transition Metal ◽  
Ethyl Acetate ◽  
Aromatic Hydrocarbons ◽  
Environmentally Friendly ◽  
Metal Free ◽  
Polycyclic Aromatic

Tert-butylamine-catalyzed free radical annulations with cyclic diaryliodoniums occur in environmentally friendly ethyl acetate and do not require transition metal, providing diversified polycyclic aromatic hydrocarbons by modulating substituents.

scholarly journals Contrasting Effects of a Nonionic Surfactant on the Biotransformation of Polycyclic Aromatic Hydrocarbons tocis-Dihydrodiols by Soil Bacteria

1999 ◽  
Vol 65 (3) ◽  
pp. 1335-1339 ◽  
Author(s):  
Christopher C. R. Allen ◽  
Derek R. Boyd ◽  
Francis Hempenstall ◽  
Michael J. Larkin ◽  
Narain D. Sharma
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Nonionic Surfactant ◽  
Aromatic Hydrocarbons ◽  
Aqueous Solubility ◽  
Enhancement Effect ◽  
Reaction Conditions ◽  
Polycyclic Aromatic ◽  
Triton X ◽  
Rate Of Accumulation

ABSTRACT The biotransformation of the polycyclic aromatic hydrocarbons (PAHs) naphthalene and phenanthrene was investigated by using two dioxygenase-expressing bacteria, Pseudomonas sp. strain 9816/11 and Sphingomonas yanoikuyae B8/36, under conditions which facilitate mass-transfer limited substrate oxidation. Both of these strains are mutants that accumulate cis-dihydrodiol metabolites under the reaction conditions used. The effects of the nonpolar solvent 2,2,4,4,6,8,8-heptamethylnonane (HMN) and the nonionic surfactant Triton X-100 on the rate of accumulation of these metabolites were determined. HMN increased the rate of accumulation of metabolites for both microorganisms, with both substrates. The enhancement effect was most noticeable with phenanthrene, which has a lower aqueous solubility than naphthalene. Triton X-100 increased the rate of oxidation of the PAHs with strain 9816/11 with the effect being most noticeable when phenanthrene was used as a substrate. However, the surfactant inhibited the biotransformation of both naphthalene and phenanthrene with strain B8/36 under the same conditions. The observation that a nonionic surfactant could have such contrasting effects on PAH oxidation by different bacteria, which are known to be important for the degradation of these compounds in the environment, may explain why previous research on the application of the surfactants to PAH bioremediation has yielded inconclusive results. The surfactant inhibited growth of the wild-type strain S. yanoikuyae B1 on aromatic compounds but did not inhibit B8/36 dioxygenase enzyme activity in vitro.

The Assessment of Contamination and Source of Polycyclic Aromatic Hydrocarbons from the Sediments of the Someş River

2019 ◽  
Vol 64 (1) ◽  
pp. 55-67
Author(s):  
Vlad Pӑnescu ◽  
◽  
Mihaela Cӑtӑlina Herghelegiu ◽  
Sorin Pop ◽  
Mircea Anton ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Polycyclic Aromatic
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